Rainbow Electronics MAX1231 - Manual (Page 5)

MAX1227/MAX1229/MAX1231
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
_______________________________________________________________________________________ 5
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Externally clocked conversion 208
SCLK Clock Period t CP
Data I/O 100
ns
SCLK Duty Cycle t CH 40 60 %
SCLK Fall to DOUT Transition t
DOT
C
LOAD
= 30pF 40 ns
CS Rise to DOUT Disable t DOD C LOAD = 30pF 40 ns
CS Fall to DOUT Enable t DOE C LOAD = 30pF 40 ns
DIN to SCLK Rise Setup t DS 40 ns
SCLK Rise to DIN Hold t DH 0 ns
CS to SCLK Rise Setup t CSS 40 ns
SCLK Rise to CS Hold t CSH 0 ns
t CSW CKSEL = 00, CKSEL = 01 (temp sense) 40 ns
CNVST Pulse Width
CKSEL = 01 (voltage conversion) 1.4 µs
t T S Temp sense 55
Voltage conversion 7
CS or CNVST Rise to EOC
Low (Note 9)
Reference power-up 65
µs
TIMING CHARACTERISTICS (Figure 1)
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
0 1024 2048 3072 4096
INTEGRAL NONLINEARITY
vs. OUTPUT CODE
MAX1227/29/31 toc01
OUTPUT CODE
INTEGRAL NONLINEARITY (LSB)
-1.0
-0.4
-0.6
-0.8
-0.2
0
0.2
0.4
0.6
0.8
1.0
0 1024 2048 3072 4096
DIFFERENTIAL NONLINEARITY
vs. OUTPUT CODE
MAX1227/29/31 toc02
OUTPUT CODE
DIFFERENTIAL NONLINEARITY (LSB)
SINAD vs. FREQUENCY
MAX1227/29/31 toc03
FREQUENCY (kHz)
AMPLITUDE (dB)
100 10 1
10
20
40
30
60
50
90
80
70
100
0
0.1 1000
Typical Operating Characteristics
(V DD = +3V, V REF = +2.5V, f SCLK = 4.8MHz, C LOAD = 30pF, T A = +25°C, unless otherwise noted.)
Note 9: This time is defined as the number of clock cycles needed for conversion multiplied by the clock period. If the internal refer-
ence needs to be powered up, the total time is additive. The internal reference is always used for temperature measure-
ments.